npm scripts

browserSync.js

var browserSync = require("browser-sync");
browserSync({
  proxy: 'localhost:9292',
  files: [
    "./css/**/*",
    "./js/**/*",
    "./images/**/*",
    "./fonts/**/*",
    "./**/*.php",
  ]
});

package.json

{
  "private": true,
  "scripts": {
    "build": "npm run scss && npm run postcss",
    "scss": "node-sass ./scss/style.scss -o ./css/",
    "postcss": "postcss ./css/style.css --use autoprefixer -o ./css/style.css",
    "watch": "nodemon -e scss -x \"npm run build\"",
    "bs": "node ./browserSync.js",
    "start": "npm run watch & npm run bs"
  },
  "devDependencies": {
    "autoprefixer": "^8.6.4",
    "browser-sync": "^2.24.5",
    "node-sass": "^4.9.0",
    "nodemon": "^1.17.5",
    "postcss-cli": "^5.0.1"
  },
  "browserslist": [
    "last 2 versions",
    "ie 11"
  ]
}